Support matching and modifying IP TTL.

[sliver-openvswitch.git] / datapath / actions.c

diff --git a/datapath/actions.c b/datapath/actions.c
index 3296dee..61b903f 100644 (file)
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -151,6 +151,12 @@ static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
        *addr = new_addr;
 }
 
+static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)
+{
+       csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
+       nh->ttl = new_ttl;
+}
+
 static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
 {
        struct iphdr *nh;
@@ -172,6 +178,9 @@ static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key)
        if (ipv4_key->ipv4_tos != nh->tos)
                ipv4_change_dsfield(nh, 0, ipv4_key->ipv4_tos);
 
+       if (ipv4_key->ipv4_ttl != nh->ttl)
+               set_ip_ttl(skb, nh, ipv4_key->ipv4_ttl);
+
        return 0;
 }